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• W4295296295 abstract "The present study describes creating an attenuated Salmonella Gallinarum (SG) strain with reduced endotoxicity to prevent fowl typhoid. The strain was attenuated by deleting the lon, cpxR, and rfaL virulence-related genes. Endotoxicity was reduced by deleting the pagL open reading frame and replacing it with the lpxE gene derived from Francisella tularencis. Both events, (1) deletion of the pagL and (2) introduction of the lpxE genes, conferred reduced endotoxicity by detoxifying the lipid A structure. The detoxified SG strain (SGVSdt) was well tolerated in 7-day-old chicks when administered orally at 1 × 108 CFU/bird and in 14-day-old birds administered 1 × 107 CFU/bird subcutaneously. Parenteral immunization of detoxified vaccine strain was completely safe in birds and free of environmental contamination. Subcutaneous immunization conferred disease protection and induced humoral and cell-mediated immune responses marked by Th1-skewed patterns similar to those produced by the commercial SG9R vaccine strain. Compared with the SG9R-based vaccine, the SGVSdt construct generated significantly fewer inflammatory TNF-α responses while significantly inducing IFN-γ cytokine levels as an indication of an adaptive antibacterial response. The differentiating infected from vaccinated animals (DIVA) capability was on par with the predecessor SGVS. This study presents an appealing biological strategy to minimize lipid A-mediated endotoxicity without compromising protective efficacy against the SG challenge. Reduced endotoxicity permits the utilization of higher inoculation doses to maximize protection against fowl typhoid." @default.
• W4295296295 created "2022-09-12" @default.
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• W4295296295 date "2022-11-01" @default.
• W4295296295 modified "2023-09-30" @default.
• W4295296295 title "Prospective lipid-A altered live attenuated Salmonella Gallinarum confers protectivity, DIVA capability, safety and low endotoxicity against fowl typhoid" @default.
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• W4295296295 doi "https://doi.org/10.1016/j.vetmic.2022.109572" @default.
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